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US2939095A
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Assignee: Sprague Electric Co
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Filing: 1957-02-26
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Granted: 1960-05-31
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Expires: 1977-02-26
Abstract
No abstract record available.
Inventors
- 👤 Sidney L Chertok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:57
CPC Classifications
H; H03; H03H; H03H1/00; H03H7/00; H03H7/42; H03H7/425; H03H7/427
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1664494A
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US1791377A
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US1978098A
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US2080024A
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US2388054A
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US2415602A
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US2590821A
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US2583353A
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US2737579A
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US2792557A
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US2792561A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |